import {mapGetters } from 'vuex'

export default{
  computed:{
    ...mapGetters('m_cart',['total'])
  },
  watch:{
    total(){
      this.setBadge()
    }
  },
  onShow(){
      this.setBadge()
  },
  methods: {
    setBadge(){
       uni.setTabBarBadge({
         index:2,
         text:this.total + '' //text必须是字符串
       })
    }
  }
 
}